Research Papers: Electronic Cooling

Numerical Analysis of Convective Heat Transfer From an Elliptic Pin Fin Heat Sink With and Without Metal Foam Insert

[+] Author and Article Information
Hamid Reza Seyf

 Islamic Azad University, Karaj Branch, P.O. Box 31485-313, Tehran, Karaj, 3158777878 Iran

Mohammad Layeghi

 University of Tehran, P.O. Box 31485-77871, Tehran, Karaj, 3158777878 Iranmlayeghi@ut.ac.ir

J. Heat Transfer 132(7), 071401 (Apr 22, 2010) (9 pages) doi:10.1115/1.4000951 History: Received January 08, 2009; Revised December 11, 2009; Published April 22, 2010; Online April 22, 2010

A numerical analysis of forced convective heat transfer from an elliptical pin fin heat sink with and without metal foam inserts is conducted using three-dimensional conjugate heat transfer model. The pin fin heat sink model consists of six elliptical pin rows with 3 mm major diameter, 2 mm minor diameter, and 20 mm height. The Darcy–Brinkman–Forchheimer and classical Navier–Stokes equations, together with corresponding energy equations are used in the numerical analysis of flow field and heat transfer in the heat sink with and without metal foam inserts, respectively. A finite volume code with point implicit Gauss–Seidel solver in conjunction with algebraic multigrid method is used to solve the governing equations. The code is validated by comparing the numerical results with available experimental results for a pin fin heat sink without porous metal foam insert. Different metallic foams with various porosities and permeabilities are used in the numerical analysis. The effects of air flow Reynolds number and metal foam porosity and permeability on the overall Nusselt number, pressure drop, and the efficiency of heat sink are investigated. The results indicate that structural properties of metal foam insert can significantly influence on both flow and heat transfer in a pin fin heat sink. The Nusselt number is shown to increase more than 400% in some cases with a decrease in porosity and an increase in Reynolds number. However, the pressure drop increases with decreasing permeability and increasing Reynolds number.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Schematic of the elliptic pin fin heat sink

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Figure 2

Schematic of the computational domain, coordinate system, and boundary conditions

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Figure 3

Geometry and pin fin configuration of the problem

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Figure 4

computational grid around pin fins with details of inlet and outlet air blocks

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Figure 5

Streamlines around pin fins with or without metal foam insert in the plane z=10 mm at Re=380

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Figure 6

The temperature contours around pin fins without metal foam insert at three different Reynolds numbers in the plane z=10 mm and Pr=0.71

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Figure 7

Effect of porosity on the overall Nusselt number of the pin fin heat sink Pr=0.7

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Figure 8

Effect of permeability on pressure drop (in Pa) at various Reynolds numbers

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Figure 9

Effect of porosity on the efficiency of the pin fin heat sink Pr=0.7




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